import File from "sys/file"
let fib = j => {
  let mut fnow = 0, fnext = 1
  for (let mut n = 0; n <= j; n += 1) {
    if (n == 0 || n == 1) {
      let output1 = " " ++ toString(n)
      ignore(File.fdWrite(File.stdout, output1))
    } else {
      let tempf = fnow + fnext
      fnow = fnext
      fnext = tempf
      let output2 = " " ++ toString(fnext)
      ignore(File.fdWrite(File.stdout, output2))
    }
  }
}
fib(20)